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Related Concept Videos

Overview of Hematopoiesis01:20

Overview of Hematopoiesis

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Hematopoiesis, or blood cell production, is a vital biological process that begins early in embryonic development and continues throughout life. This process generates the various types of cells found in blood, including red blood cells, white blood cells, and platelets from hematopoietic stem cells (HSCs).
Developmental Phases of Hematopoiesis
Initially, HSCs are formed in the embryonic yolk sac, a critical site for early blood cell production. These stem cells subsequently migrate to other...
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Hematopoiesis01:21

Hematopoiesis

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The process of blood cell formation is called hematopoiesis. Hematopoiesis starts early during development, on the seventh day of embryogenesis. This phase of hematopoiesis is called the primitive wave, wherein the extraembryonic yolk sac allows the production of erythroid cells and endothelial cells from a common precursor called hemangioblast. The erythroid cells provide oxygen to support the growth of the rapidly dividing embryo. Hemangioblasts later develop into hematopoietic stem cells or...
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Fetal Circulation01:14

Fetal Circulation

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Fetal circulation is a unique system that facilitates the exchange of gases, nutrients, and waste products between the developing fetus and the mother. This intricate process takes place through a special organ called the placenta.
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Development of Blood Vessels01:07

Development of Blood Vessels

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The development of the vascular system in a fetus is a complex and intricate process that begins as early as 15 to 16 days post-conception. This process starts outside the embryo, specifically in the mesoderm of the yolk sac, chorion, and connecting stalk. Approximately two days later, the formation of blood vessels occurs within the embryo itself.
The initial formation of this system is facilitated by the small amount of yolk present in the ovum and yolk sac. Blood vessels originate from...
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Production of Formed Elements01:34

Production of Formed Elements

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Hemangioblasts are multipotent stem cells originating from the mesoderm. They give rise to hematopoietic stem cells (HSCs), which undergo hematopoiesis to produce all the formed elements of blood. This process is regulated by a complex network of hematopoietic growth factors, including transcription factors, growth factors, and cytokines. These factors stimulate the HSCs to divide and differentiate, though some HSCs remain undifferentiated to maintain a self-renewing pool.
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Mouse Fetal Liver Culture System to Dissect Target Gene Functions at the Early and Late Stages of Terminal Erythropoiesis
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Decoding human fetal liver haematopoiesis.

Dorin-Mirel Popescu1, Rachel A Botting1, Emily Stephenson1

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Summary
This summary is machine-generated.

This study maps human fetal blood cell development using single-cell profiling. It reveals new insights into hematopoietic stem and multipotent progenitor (HSC/MPP) differentiation and tissue microenvironment influences.

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Area of Science:

  • Developmental Biology
  • Hematology
  • Immunology

Background:

  • Definitive hematopoiesis in the fetal liver is crucial for blood and immune cell generation.
  • Human fetal liver hematopoiesis, particularly the behavior of hematopoietic stem and multipotent progenitors (HSC/MPPs), is not well understood.
  • Understanding early blood cell development is key to addressing pediatric blood disorders.

Purpose of the Study:

  • To identify the full range of human blood and immune cells during development.
  • To map the differentiation pathways of HSC/MPPs and the impact of tissue microenvironments.
  • To create a comprehensive atlas of fetal liver hematopoiesis.

Main Methods:

  • Single-cell transcriptome profiling of approximately 140,000 fetal liver cells and 74,000 cells from skin, kidney, and yolk sac.
  • Inference of differentiation trajectories from HSC/MPPs.
  • Functional validation of HSC/MPP differentiation potential changes.

Main Results:

  • Identification of the complete repertoire of human blood and immune cells during development.
  • Discovery of physiological erythropoiesis in fetal skin.
  • Detection of mast cell and natural killer/innate lymphoid cell precursors in the yolk sac.
  • Observation of a gestational shift in fetal liver hematopoietic composition from erythroid dominance, with corresponding changes in HSC/MPP potential.

Conclusions:

  • The study provides an integrated map of human fetal liver hematopoiesis.
  • This map serves as a blueprint for studying pediatric blood and immune disorders.
  • The findings offer a reference for utilizing the therapeutic potential of HSC/MPPs.